Effective corrosion inhibition performance of Ce3+ doped sol–gel nanocomposite coating on aluminum alloy

Corrosion stability of cerium-doped cataphoretic epoxy coatings on AA6060 alloy

“…Upon immersion in the corrosive media, the ingress of electrolyte through the pores of epoxy coatings progresses and cerium starts diffusing and precipitating on the corroding parts of AA6060 substrate. Owing to the occurrence of reactions (7) to (10), a self‐healing process of Al under epoxy coating containing Ce proceeds, as reflected by the increase in R ct values after certain time period of exposure . This kind of protection depends on the Ce loading, 5 mM Ce was proven as optimum concentration.…”

“…Moreover, cerium was also proven to exhibit a self‐healing ability. Recent studies have reported on the improved characteristics of protective hybrid organic–inorganic coatings upon addition of different amounts of cerium‐nitrate , ceria nanoparticles, unmodified , or activated with cerium‐nitrate , Ce/Mo or Ce/Zn/Mo nanocontainers also activated with cerium‐nitrate , as fillers, for corrosion mitigation purposes. Combinations of polyaniline (PANI) and ceria and addition of ceria nanoparticles in epoxy coatings were also reported.…”

Functionalizable Sol-Gel Silica Coatings for Corrosion Mitigation

“…It is worth emphasising that an increasingly frequent solution in the context of the corrosion protection of metallic substrates is the use of various materials in one sol-gel coating, either as inorganic [ 4 , 32 , 37 , 40 , 42 ], organic [ 30 ] or organic-inorganic hybrids [ 1 , 9 , 43 ]. Finally, the resulting materials are hybrid and/or layered materials and/or nanocomposites which are characterised by different properties.…”

“…Additionally, the chemical stability of an oxide sol-gel network and the possibility of the gradual dissolution of active compounds, such as corrosion inhibitors, from the oxide network, makes this a perfect material for long-term corrosion protection. Moreover, organic-inorganic hybrids doped with corrosion inhibitors, such as cerium salts (III), have a self-protecting or ‘healing’ effect [ 1 ], in that the resultant oxides and cerium hydroxides formed as a result of exposure to the corrosive agent are precipitated at the place of damage and help seal the local area of damage [ 9 ].…”

“…There is a wealth of published data providing information regarding the activation, functionalization and protection of metallic surfaces [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. Such surface modifications are always associated with the need to adapt the surface properties of metallic substrates to a working environment or conditions without a radical change in the metallic material itself.…”